ito:
chose Pattern, turned off the screen, turned it back on and clicked on Forgot in the lower-right corner. After I gave in my Google password it changed automatically back to slide.

In the settings the option "none" is still grayed-out but it's selected anywhere and it works.

If you happen to have CyanogenMod 7+ installed there's an option called Profiles. You can setup your default profile to have no screen lock at all (not even slide lock).

at ito pa

you could try this:

Use Titanium Backup to backup all your Apps + Data.
Reset the phone to factory defaults.
Restore all apps and data except for Activesync.
This will definitely fix your issues. Question is, "Is it worth the effort?"

ito:
chose Pattern, turned off the screen, turned it back on and clicked on Forgot in the lower-right corner. After I gave in my Google password it changed automatically back to slide.

In the settings the option "none" is still grayed-out but it's selected anywhere and it works.

If you happen to have CyanogenMod 7+ installed there's an option called Profiles. You can setup your default profile to have no screen lock at all (not even slide lock).

at ito pa

you could try this:

Use Titanium Backup to backup all your Apps + Data.
Reset the phone to factory defaults.
Restore all apps and data except for Activesync.
This will definitely fix your issues. Question is, "Is it worth the effort?"